VENTING
RECOMMENDED VENTING CLEARANCES PER THE NATIONAL FUEL GAS CODE*
*IMPORTANT NOTE
HEAT TRANSFER
PRODUCTS
C
12 | in. |
| |
| minimum |
Direct vent terminal clearance Minimum clearance, C
4 ft.minimum |
| |
| 4 |
|
| minimum | |
|
| ft. |
12 | in. |
|
|
| |
| minimum | |
Mechanical draft vent terminal (see 10.8.1)*
Mechanical draft vent terminal
(see 10.8.2)*
Less than 10 ft.
12 in.minimum
3 ft.minimum
RECOMMENDS A
MINIMUM
CLEARANCE OF 4 FEET WHERE THE PLUME CAUSED BY THE UNIT MAY OBSTRUCT VIEWS OR AFFECT THE COSMETIC LOOK OF THE BUILDING.
Input (Btu/hr) | Clearance (in.) |
10,000 or less | 6 |
10,001 to 50,000 | 9 |
Over 50,000 | 12 |
(see 10.8.3)* |
|
For SI units: 1 ft = 0.305 m; 1 in. = 25.4 mm; 1 Btu/hr = 0.293 W
e rad G
Forced air inlet
EXIT TERMINALS OF MECHANICAL DRAFT AND
* REFERENCE: THE NATIONAL FUEL GAS CODE 2002 EDITION
CAUTION
Flue Gas will condense as it exits the vent termination. This condensate can freeze on exterior building surfaces which may cause discoloration of these surfaces. Consideration should be given to the plume of condensation that exits the exhaust which may affect the cosmetic appearance of the building.
All venting must be properly supported. The Munchkin is not intended to support any venting whatsoever. All piping, glue, solvents, cleaners, fittings and components, must conform to ASTM (American Society for Testing and Materials), and ANSI (American National Standards Institute). It is recommended that you use one of the optional vent kits specifically designed for Munchkin installa- tions, available from Heat Transfer Products, Inc.
Friction Loss Equivalent Table for 4" or 6" vent
Fittings or Piping |
| Equivalent Feet |
4" or 6" 90 degree elbow | = | 5 |
4" or 6" 45 degree elbow | = | 3 |
4" or 6" Coupling | = | 0 |
4" or 6" air inlet tee | = | 0 |
4" or 6" Plastic Pipe | = | 1 |
4" or 6" V2000 vent kit | = | 0 |
Example: Installation requires the following material for both inlet and exhaust piping for the Munchkin
13
